SC11 Spectrum Analyser

The spectrum analyser program enables in-depth analysis of magnetic field, vibration, sound and other sources such as the video output from an SEM in spot-mode. It displays the waveforms and spectra of up to 8 channels (4 in the SC11/Basic), highlighting the selected channel. It has a wide range of units for use with all the sensors. When measuring vibration with the Wicoxon 731A accelerometer, the software integrates its output to provide velocity and displacement units as well as acceleration.

Tracking cursors are provided to measure features of the spectrum as well as define bands for RMS measurement. Harmonic cursors can be used to recognise harmonics in the spectrum and enable more accurate measurement of the fundamental frequency. Successive spectra can be combined over a period of time, as an average to reduce noise, or to find the worst case peak values. Spectra can be data-logged to a file at a maximum rate of once every minute to trace sources that vary.

An example below is a sound level measurement with comparison to the Electron Microscope manufacturer’s specification, in third octave format. The specification line changes colour if the specification is exceeded, as shown.